Saw this posted on facebook and thought I would share it. The basic idea is the higher the ratio of solo tackles to assisted tackles, the more you would consider a team a "spread" offense. Not sure how useful this is but thought it was interesting:
http://www.footballstudyhall.com/2014/2/24/5437400/college-football-spread-offenses
http://www.footballstudyhall.com/2014/2/24/5437400/college-football-spread-offenses